Keystones — Lintel
Five GCSE retrieval questions · 15 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00084 in standard form
Answer: 8.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 24.64cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 10:8:12. What fraction of the sweets are orange?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 38, 17, 38, 41, what is the missing number?
Answer: 66